I have two folders on my DX50 which are listed as "LOST.DIR" one of these is on the internal storage of my DX50 and the other is on my 64Gb Sandisk Micro SD card.

I assume that these are more than likely files that have been deleted at some point.....however I cannot get rid of them.....I have tried deleting them but they just keep re-appearing. Can anybody advise as to what they actually are and if they are deleted albums or files...how I can get rid of them??

it's an android system. you can't simply delete them, they will appear. they need to be there for the player to function normally...

Very interested in your thoughts on compatibility and synergy with the 4.Ai.

Look forward to your review.

Mark

Using Comply foam tips I must say the 4.Ai does quite well with the DX50, but adding an amp helps open things up. Then again, this is true for my $1600 Noble Audio Kaiser 10 as well

For a very enjoyable, neutral-ish-but-ever-so-slightly-warm presentation, I wouldn't hesitate recommending the DX50 + 4.Ai. Toss in an amp and everything gets a bit better, only you (and your usage habits) can decide if the improvements are worth the added bulk. I have no problems with hiss, but the very sensitive 4.Ai lets me hear (very, very faintly) when I'm scrolling through the album view!

Using Comply foam tips I must say the 4.Ai does quite well with the DX50, but adding an amp helps open things up. Then again, this is true for my $1600 Noble Audio Kaiser 10 as well

For a very enjoyable, neutral-ish-but-ever-so-slightly-warm presentation, I wouldn't hesitate recommending the DX50 + 4.Ai. Toss in an amp and everything gets a bit better, only you (and your usage habits) can decide if the improvements are worth the added bulk. I have no problems with hiss, but the very sensitive 4.Ai lets me hear (very, very faintly) when I'm scrolling through the album view!

this is my combo so far. 4.ai (forza cable) + DX50 + Heron (topkits) via Ibasso IC copper. i don't hear any hiss whatsoever. although im looking for 1964ears V6-S for an upgrade, i dont know if this will give me significant upgrade to my 4.ai. coz as of now this combo was such perfect for my ears.

My 4.Ai was fine with all of my other amps and sources. I too am using Comply tips--maybe I've been using the wrong size?

If it sounds fine with your other amps and sources, then I wouldn't blame the tips. I find it odd that you get hiss and I don't... Too bad that we don't live close to eachother so we could try swapping DX50's